Medical journalist and educator Prof Ivan Oransky talks about research misconduct that, once uncovered after publication, leads to retractions of scientific papers, damaged careers, and an undermining of the scientific process. Prof Oransky suggests why retractions are on the increase, and how technology is being enlisted in the fight against fraud. Presented by Dr Andi Horvath.

Chemistry researcher Assoc Prof Spencer Williams talks about the rapidly emerging understanding of human microbiota -- the diverse and numerous microorganisms that reside on and within our bodies -- and particularly how the composition of our gut flora can determine the state of our own health. Presented by Dr Andi Horvath.